The structure and technical requirements of multi-way valve castings for excavators were introduced.The casting process of these castings was elaborated.Based on 3D printing technology,there was no need to consider the draftability of the mold,and multiple valve stems and oil passage sand cores were combined to form an integrated valve core.During the manufacturing process,the integrated valve core from 3D printing was combined with traditional manual modeling,which not only simplified the production difficulty of multi-way valves but also significantly improved production efficiency and reduced production costs.The size of the oil channel inside the casting reached CT8 grade standards,the appearance quality of the casting was good,and no leakage was observed in the casting cavities.Ultrasonic testing of various cross-sections also revealed no significant defects.
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